diff --git a/xCAT-server-2.0/lib/xcat/plugins/mknb.pm b/xCAT-server-2.0/lib/xcat/plugins/mknb.pm
index c38df2b56..7e5201ba0 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/mknb.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/mknb.pm
@@ -94,6 +94,16 @@ sub process_request {
       } 
    }
    my $cfgfile;
+   if ($arch =~ /x86/) {
+      if (! -r "$tftpdir/pxelinux.0") {
+         unless (-r "/usr/lib/syslinux/pxelinux.0") {
+            $callback->({error=>["Unable to find pxelinux.0 "],errorcode=>[1]});
+            return;
+         }
+         copy("/usr/lib/syslinux/pxelinux.0","$tftpdir/pxelinux.0");
+         chmod(0644,"$tftpdir/pxelinux.0");
+      }
+   }
    foreach (keys %{$hexnets}) {
       if ($arch =~ /x86/) {
          open($cfgfile,">","$tftpdir/pxelinux.cfg/".uc($_));
diff --git a/xCAT-server-2.0/lib/xcat/plugins/pxe.pm b/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
index 785d5ae64..f6e3bda60 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
@@ -202,6 +202,18 @@ sub process_request {
         push @nodes,$_;
      }
   }
+  if (! -r "$tftpdir/pxelinux.0") {
+     unless (-r "/usr/lib/syslinux/pxelinux.0") {
+       $callback->({error=>["Unable to find pxelinux.0 "],errorcode=>[1]});
+       return;
+     }
+     copy("/usr/lib/syslinux/pxelinux.0","$tftpdir/pxelinux.0");
+     chmod(0644,"$tftpdir/pxelinux.0");
+   }
+   unless ( -r "$tftpdir/pxelinux.0" ) {
+      $callback->({errror=>["Unable to find pxelinux.0 from syslinux"],errorcode=>[1])};
+      return;
+   }
 
       
   if (ref($request->{arg})) {